Methane formation in tropical reservoirs predicted from sediment age and nitrogen.

Abstract:

:Freshwater reservoirs, in particular tropical ones, are an important source of methane (CH4) to the atmosphere, but current estimates are uncertain. The CH4 emitted from reservoirs is microbially produced in their sediments, but at present, the rate of CH4 formation in reservoir sediments cannot be predicted from sediment characteristics, limiting our understanding of reservoir CH4 emission. Here we show through a long-term incubation experiment that the CH4 formation rate in sediments of widely different tropical reservoirs can be predicted from sediment age and total nitrogen concentration. CH4 formation occurs predominantly in sediment layers younger than 6-12 years and beyond these layers sediment organic carbon may be considered effectively buried. Hence mitigating reservoir CH4 emission via improving nutrient management and thus reducing organic matter supply to sediments is within reach. Our model of sediment CH4 formation represents a first step towards constraining reservoir CH4 emission from sediment characteristics.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Isidorova A,Grasset C,Mendonça R,Sobek S

doi

10.1038/s41598-019-47346-7

subject

Has Abstract

pub_date

2019-07-29 00:00:00

pages

11017

issue

1

issn

2045-2322

pii

10.1038/s41598-019-47346-7

journal_volume

9

pub_type

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